Preparation of polyglycidyl methacrylate microspheres and nanocomposite hydrogels crosslinked by hydrogen bonds
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ORIGINAL PAPER
Preparation of polyglycidyl methacrylate microspheres and nanocomposite hydrogels crosslinked by hydrogen bonds Chengrui Yuan 1 & Jinhua Chen 1 & Yu Jia 1 & Dezhong Yin 1 Received: 5 September 2019 / Accepted: 31 January 2020 # The Polymer Society, Taipei 2020
Abstract In order to meet the application of the flexible wings of the submersible, nanocomposite hydrogels(NC gels) was prepared. Preparation of polyglycidyl methacrylate (PGMA) microspheres and correspondingly NC gels were reported. PGMA microspheres were prepared and modified by N-Methyl-D-glucamine, followed by free radical polymerization of acrylamide in the presence of microspheres to construct nanocomposite hydrogel. FT-IR, XPS and DLS verified a successful introduction of hydroxyl groups during modification. The effects of the particle size and content of the microspheres on the swelling properties of the composite hydrogels were investigated. Hydrogen bonds between hydroxyl groups and polyacrylamide molecular chains play important roles to the swelling property of NC gels. The intermolecular interaction and the crosslinking density were enhanced by the hydrogen bonds, and resultantly, swelling ratio of NC gels decreases. Keywords Polymer microspheres . Nanocomposite hydrogels . Hydrogen bond . Swelling property
Introduction Hydrogel is composed of a polymer three-dimensional network structure by crosslinked physical force or chemical action and a large amount of water [1–3]. Hydrogels can be widely used in tissue engineering [4], electrolytes for supercapacitors [5], drug release [6, 7] and other fields due to their unique physicochemical properties. However, the conventional hydrogel has microscopic defects such as low molecular chain crosslink density, friction between chains or the inhomogeneity in hydrogel network, which makes it difficult for the hydrogel to meet the requirements of normal load. [8–10] Therefore, high strength hydrogels are prepared by forming special structures or introducing other components. Common types of high-intensity hydrogels include topological hydrogels (TP gels) [11], double network hydrogels (DN gels) [12, 13], nanocomposite hydrogels (NC gels) [14, 15], etc. Due to the complex structure Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10965-020-2034-8) contains supplementary material, which is available to authorized users. * Dezhong Yin [email protected] 1
School of Sciences, Northwestern Polytechnical University, Xi’an 710072, China
of the topological hydrogel “8” ring and the complicated preparation of the double-network hydrogel, the application in actual production is limited. NC gels have become a research hotspot due to their simple preparation, obvious improvement of mechanical properties and large selection of raw materials. Nanoparticles include metal or metal oxide [16–18], ceramic nanoparticles [19, 20], carbon-based nanomaterials [21, 22] and polymeric nanoparticles [23, 24]. Haraguchi and coworkers [14] first reported the synthesis o
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